Improved burglar-alarm



`be made adaptable to open or close joints between v square shoulders at each -end,) cut in the under side sata l ISAAC N. BUCK, OF

ELGIN, ILLINOIS.

Lette/rs .Patent No. 89,286, dated Il prtl 27, 1869.

IMPROVE!) BURG-LAR-ALARM.

m Schedule referred to in these Letters Patent and making part ofjh BUBB- To all whom it may concern:

Be it known that I, ISAAC N. BUCK, of the city of Elgin, county of Kane, in the State of Illinois, have invented certain new and useful Improvements in Burg lar-Alarms, relating particularly to improvements upon the burglar-alarm invented by me, and for which I received Letters Patent, No. 85,066, dated December 22, 1868.

My present invention consists in a novel and valuaf ble construction and arrangement of the operatingbolt.

The advantages possessed by this present improvement over the invention referred to may be enumerated as follows:

It is simpler in its construction, proportionately lessening the cost of production.

But one key is requisite for winding the clock-work, and controlling the alarm.

The operative bolt can, in effect, be lengthened, by means of adjustment provided, so that the alarm may doors or windows and their frames. j

To enable persons skilled in the art to construct my invention, I do hereby declare the following specification, taken in connection with the drawings furnished, and forming a part of the same, to be a true and clear description thereof.

Reference being had to the drawings- Figure 1 represents one of my improved burglaralarms, with the cover of the case removed, showing its internal construction. v'lhe bell and clock-work mechanism are here shown, but possess no novel features.

A represents the case, which is of ordinary construction, with the exception of the portion marked A front, which is perforated, to admit of the free escape of the sound from the alarm, when in operation.

B represents the clock-work striking-mechanism. The bell is plainly marked.

B B is the key-shaft for winding the clock-work.

C is the pallet-arm.

D is a stud, against which the pallet-arm C presses, when the clock-work is not in action, and by means of which action is suspended.

E is the operative bolt, the movement of which causes the alarm to sound. As shown in the drawing, the pallet-arm is prevented from vibration by the stud D, which is set in the bolt E.

E E kis a spiral spring, so set as to constantly press the bolt E toward the right. y

Eirepresents a deep shoulder, (or mortise, having of the bolt E.

F represents a tumbler or key-shaft, to which the key isapplied, for adjustment of the alarm.

G is a lever, projecting from the shaft F, and, by its contact with either of the shoulders, at E2, causes the. bolt E to move to the right or left.

The end of this lever is formed iu two angles, to t corresponding angles in the shoulder at the left-hand side of the mortise E2, and that portion of the case containing the stud, marked I, and which serves to hold the bolt E in position.

By means of this angular form, the lever G, when turned to the left, forcing the bolt E with it, is retained in position, by the pressure of the bolt againstlit.

H represents a wire spring, passed over and around the stud I, and is so adjusted that it bears upon the square sides of the tumbler-shaft F, securing the same in any desired position.

M represents an adjusting-screw, inserted inthe end of the bolt E, by means of which the' bolt can, in el'ect, be elongated, by advancing or withdrawing the screw, the head of which would then serveas the end of the bolt.

Figure 2 represents a cross-section of the alarm, cut at line marked K K. Parts are lettered as 4in gFigure 3 represents the front portion of the case A, commonly called the face-plate. The perforations are here shown also the end of the bolt E and adjustingscrew M.

The operation of the alarm is as now described:

We will suppose, by way ofillustratiou, that an alarm, as shown in the drawing, was inserted into that stile of a door to which the hinges are attached, with the face-plate toward the jamb. The alarm being wound up, and the door closed, we would apply the key to the shaft F, turning it to the right. By this action, the lever G would be released from contact with the bolt E, thereby permitting the spring E E to projectIthe bolt out of the case, against that part of the doorframe immediately opposite. By this contact with the frame, the bolt is kept suficiently in position to prevent the operation of the alarm.

It will be readily seen that, when the door is opened, and resistance to the bolt removed, the spring E E, by its action, projects the bolt, thereby releasing the pallet-arm, causing the mechanism tooperate against the bell, and producing analarm, which will not cease until the bolt is again forced in, or until the clock-work has run down.

Should the space between a door or window and its frame be so great as to admit of the undesired action of the alarm, it can easily be adjusted and remedied, by turning the adjusting-screw outward until a sufficient length has been added to overcome the excess of space. 1

It is obvious that the alarm can as well be set on either edge of the door, or inthe frame, as may be desired, and that their application to windows in simi- 2. The combination of lthe tumbler-shaft F, with lair manner will produce the desired result of security its lever-arm G, the operating-bolt E, with springs E against the intrusion of' burglars. E and H, arranged, relatively to each other, in the Having thus described my invention, manner and for the purposes substantially as shown I claim as new, and desire to secure by Letters and described.

Patent- ISAAC N. BUCK.

l. In a burglar-alarm, the adjusting-screw M, in Witnesses:

combination with the operating-bolt E, substantially E. D. WALDRON,

as shown and described, for the purpose specified. C. H. SMITH. Y 

